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32. Multifunctional Copper Sulfide Urchin‐Like Nanostructures for Adsorption and Photocatalysis of Water Contaminants.

Author

Lopes, Joana L., Estrada, Ana C., and Trindade, Tito

Subjects
PHOTOCATALYTIC water purification, COPPER sulfide, WATER purification, WASTEWATER treatment, GRAPHENE oxide
Abstract

We reported here a one‐step chemical route to prepare nanocomposites comprising CuS nanophases supported on GO sheets with magnetic properties. The synthesis reported here combines such materials in single‐nanostructures that show morphological features well‐suited for wastewater treatment. The photocatalytic performance of CuS/GO nanocomposites was first investigated towards the removal of a common organic dye (rhodamine B) and sulfamethoxazole (SMX), which is an antibiotic considered a water contaminant of emerging concern. The RhB and SMX adsorption efficiency of CuS/GO and Fe3O4/GO/CuS hybrids, as well as of CuS particles, was significantly higher than GO or Fe3O4/GO. Overall, the CuS‐based magnetic and CuS/GO hybrids have shown the capacity to uptake more than 80 % of RhB or SMX, after 120 minutes. Under blue‐led irradiation, almost complete degradation of RhB was achieved in the presence of CuS/Fe3O4/GO, after 180 minutes; and higher than 85 % degradation of SMX, after 240 minutes of irradiation. The photocatalytic behaviour of nanocomposites was best described by the first–order kinetic model, for which k values for degradation of RhB and SMX followed the order: CuS/Fe3O4/GO>CuS/GO>CuS. The tricomponent CuS/Fe3O4/GO can be easily recovered after use and be reused maintain their high photocatalytic performance, thus providing a sustainable and cost‐effective hybrid solution for water treatment. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Ionic‐Liquid‐Supported Magnetic Nanoparticles: Synthesis, Characterization, and Their Use for the Separation of Co and Ni from Li in Aqueous Solutions.

Author

Almeida, Joana C., Cardoso, Celso E. D., Neves, Márcia, Trindade, Tito, Freire, Mara G., and Pereira, Eduarda

Subjects
MAGNETIC fluids, ELECTRIC vehicle industry, MAGNETIC separation, NANOSTRUCTURED materials, AQUEOUS solutions
Abstract

The evolution of the electric vehicle market and the ongoing demand for lithium (Li), cobalt (Co) and nickel (Ni) for batteries production requires secondary sources for obtaining these elements. The recycling of Li‐ion batteries involves hydrometallurgical processes with potential environmental implications, hence there is an urgent need for sustainable and more efficient recycling methods. Functionalized colloidal magnetic nanomaterials have gained interest as sorbents as they can selectively bind and remove metal species from waters, allowing their easy recovery through magnetic separation. This work addresses the preparation and evaluation of silica‐coated magnetite nanoparticles (NPs), as alternative materials to recover Co and Ni from aqueous media, after their surface modification with 1‐methyl‐3‐propylimidazolium chloride. The magnetic nanosorbents were fully characterized and the influence of solution pH and amount of ILs on the NPs surface was evaluated. Our research allows us to conclude that IL functionalized magnetic nanoparticles can be explored as an alternative to hydrometallurgical processes for the separation of Co and Ni from alkaline lixiviates of spent lithium‐ion battery (LIB) powders. [ABSTRACT FROM AUTHOR]

Published
2024
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